-20.32% is the change from 807 to 643
Calculation steps:
[( 643 - 807 ) ÷ 807] x 100 = -20.32%
Formula
Percentage change = [(643 - 807) / 807] x 100
Subtract the new number by the original number
643 - 807 = -164
-164 ÷ 807 = -0.20322180916976457
-0.20322180916976457 x 100 = -20.32%